package com.starlinkdt.api.controller.common;

import com.starlinkdt.common.config.ProjectConfig;
import com.starlinkdt.common.constant.Constants;
import com.starlinkdt.common.domain.AjaxResult;
import com.starlinkdt.common.storage.StorageUtils;
import com.starlinkdt.common.utils.StringUtils;
import com.starlinkdt.common.utils.file.FileUtils;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;

/**
 * 文件请求处理
 * 
 * @author asset
 */
@Api("文件接口管理")
@RestController
@RequestMapping("/common/file")
public class FileController
{
    private static final Logger log = LoggerFactory.getLogger(FileController.class);

    private static final String FILE_DELIMITER = ",";

    /**
     * 通用上传请求（单个）
     */
    @ApiOperation("通用上传请求（单个）")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "file", value = "文件", paramType = "form", dataType = "file", dataTypeClass = MultipartFile.class, required = true)
    })
    @PostMapping(value = "/upload", headers = "content-type=multipart/form-data")
    public AjaxResult uploadFile(@ApiParam(value = "文件", required = true) @RequestPart("file") MultipartFile file) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = ProjectConfig.getUploadPath();
            // 上传并返回新文件名称
            String url = new StorageUtils().putMultipartFile(file, filePath);
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", url);
            ajax.put("originalFilename", file.getOriginalFilename());
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 通用上传请求（多个）
     */
    @ApiOperation("通用上传请求（多个）")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "files", value = "文件", paramType = "form", dataType = "file", dataTypeClass = MultipartFile.class, required = true)
    })
    @PostMapping(value = "/uploads", headers = "content-type=multipart/form-data")
    public AjaxResult uploadFiles(@ApiParam(value = "文件", required = true) @RequestPart("files") List<MultipartFile> files) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = ProjectConfig.getUploadPath();
            List<String> urls = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            for (MultipartFile file : files)
            {
                // 上传并返回新文件名称
                String url = new StorageUtils().putMultipartFile(file, filePath);
                urls.add(url);
                originalFilenames.add(file.getOriginalFilename());
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMITER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMITER));
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 通用下载请求
     *
     * @param fileName 文件名称
     * @param delete 是否删除
     */
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request)
    {
        try
        {
            if (!FileUtils.checkAllowDownload(fileName))
            {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = ProjectConfig.getDownloadPath() + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete)
            {
                FileUtils.deleteFile(filePath);
            }
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception
    {
        try
        {
            if (!FileUtils.checkAllowDownload(resource))
            {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = ProjectConfig.getProfile();
            // 数据库资源地址
            String downloadPath = localPath + StringUtils.substringAfter(resource, Constants.RESOURCE_PREFIX);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }
}
